So it seems really strange to me that I get zero signal at pin 7 of the ER5911. I started poking around where it was going at 10C (pin 5) and found pin 1 there was disconnected from pin 1 of 9C, so there was no SEL signal. I fixed this, there was corrosion on the trace, but sadly nothing changed. So now I'm wondering, what is this "ERDY" signal anyway? Every other pin at 10C has a signal except 5, and they all at least seem right to me... Is there something about the signal I don't get? To get nothing on the probe seems very strange.